Date: Thu, 25 Apr 2002 18:17:09 +1000 (EST) From: Edwin Groothuis <edwin@mavetju.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/37448: [PATCH] ldd/rtld support for more information of linked libraries Message-ID: <20020425081709.926F5397@k7.mavetju.org>
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>Number: 37448
>Category: bin
>Synopsis: [PATCH] ldd/rtld support for more information of linked libraries
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu Apr 25 01:20:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Edwin Groothuis
>Release: FreeBSD 4.5-RELEASE i386
>Organization:
-
>Environment:
System: FreeBSD k7.mavetju.org 4.5-RELEASE FreeBSD 4.5-RELEASE #3: Mon Mar 11 13:32:05 EST 2002 edwin@k7.mavetju.org:/usr/src/sys/compile/k7 i386
>Description:
Last night, I couldn't start glade anymore (I use it once in a
while). After checking for missing libraries, I found out that I
had to recompile it due to a change from libfreetype.so.6 ->
libfreetype.so.9. Even after the recompile it didn't start, still
complaining about libfreetype.so.6. After half a night and recompiling
all dependencies of glade and their depencies, it worked again.
I knew with ldd that it was libfreetype.so.6 which was somewhere
still needed. But I couldn't find out where it was, ldd doesn't
give information regarding the libraries itself.
This patch does two things:
- In ldd.c, it checks for the -s option (I've heard that SunOS uses
that one for this kind of feature). If so, it sets the
LD_TRACE_LOADED_OBJECTS_OPTS environment variable.
- In rtld.c, it checks for LD_TRACE_LOADED_OBJECTS_OPTS and then
prints the name of the object and doesn't skip already traced
objects. So the output will be more, but more complete.
>How-To-Repeat:
ldd `which glade`. Do you know which part needs libfreetype.so.6 ?
>Fix:
This is a patch against 4.5-RELEASE. I'm not able to do this stuff
under -current. Apologies for this.
--- /usr/src/libexec/rtld-elf/rtld.c-4.5 Thu Apr 25 18:00:23 2002
+++ /usr/src/libexec/rtld-elf/rtld.c Thu Apr 25 17:30:07 2002
@@ -1957,7 +1957,7 @@
trace_loaded_objects(Obj_Entry *obj)
{
char *fmt1, *fmt2, *fmt, *main_local;
- int c;
+ int c,opts;
if ((main_local = getenv("LD_TRACE_LOADED_OBJECTS_PROGNAME")) == NULL)
main_local = "";
@@ -1968,14 +1968,21 @@
if ((fmt2 = getenv("LD_TRACE_LOADED_OBJECTS_FMT2")) == NULL)
fmt2 = "\t%o (%x)\n";
+ opts = 0;
+ if (getenv("LD_TRACE_LOADED_OBJECTS_OPTS") != NULL)
+ opts = 1;
+
for (; obj; obj = obj->next) {
Needed_Entry *needed;
char *name, *path;
bool is_lib;
+ if (opts)
+ printf(" %s\n",obj->path);
+
for (needed = obj->needed; needed; needed = needed->next) {
if (needed->obj != NULL) {
- if (needed->obj->traced)
+ if (needed->obj->traced && opts == 0)
continue;
needed->obj->traced = true;
path = needed->obj->path;
--- /usr/src/libexec/rtld-elf/rtld.1-4.5 Thu Apr 25 17:49:29 2002
+++ /usr/src/libexec/rtld-elf/rtld.1 Thu Apr 25 17:58:33 2002
@@ -107,6 +107,9 @@
.Nm
to exit after loading the shared objects and printing a summary which includes
the absolute pathnames of all objects, to standard output.
+.It Ev LD_TRACE_LOADED_OBJECTS_OPTS
+When set to a nonempty string, causes the summary printed with
+LD_TRACE_LOADED_OBJECTS to show all shared objects and their objects.
.It Ev LD_TRACE_LOADED_OBJECTS_FMT1
.It Ev LD_TRACE_LOADED_OBJECTS_FMT2
When set, these variables are interpreted as format strings a la
--- /usr/src/usr.bin/ldd/ldd.c-4.5 Thu Apr 25 18:01:13 2002
+++ /usr/src/usr.bin/ldd/ldd.c Thu Apr 25 18:05:00 2002
@@ -48,7 +48,7 @@
void
usage()
{
- fprintf(stderr, "usage: ldd [-v] [-f format] program ...\n");
+ fprintf(stderr, "usage: ldd [-v] [-s] [-f format] program ...\n");
exit(1);
}
@@ -61,9 +61,13 @@
int rval;
int c;
int vflag = 0;
+ int sflag = 0;
- while ((c = getopt(argc, argv, "vf:")) != -1) {
+ while ((c = getopt(argc, argv, "vsf:")) != -1) {
switch (c) {
+ case 's':
+ sflag++;
+ break;
case 'v':
vflag++;
break;
@@ -101,6 +105,8 @@
/* ld.so magic */
setenv("LD_TRACE_LOADED_OBJECTS", "1", 1);
+ if (sflag)
+ setenv("LD_TRACE_LOADED_OBJECTS_OPTS", "1", 1);
if (fmt1)
setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1);
if (fmt2)
--- /usr/src/usr.bin/ldd/ldd.1-4.5 Thu Apr 25 18:01:09 2002
+++ /usr/src/usr.bin/ldd/ldd.1 Thu Apr 25 18:03:24 2002
@@ -9,6 +9,7 @@
.Sh SYNOPSIS
.Nm
.Op Fl v
+.Op Fl s
.Op Fl f Ar format
.Ar program ...
.Sh DESCRIPTION
@@ -38,6 +39,11 @@
option displays an verbose listing of the dynamic linking headers
encoded in the executable. See the source code and include
files for the definitive meaning of all the fields.
+.Pp
+The
+.Fl s
+option displays all shared objects and also the shared objects they
+are depending on.
.Sh SEE ALSO
.Xr ld 1 ,
.Xr nm 1 ,
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